US6577989B2 - Circuit arrangement for measured value detection, transfer and analysis - Google Patents

Circuit arrangement for measured value detection, transfer and analysis Download PDF

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Publication number
US6577989B2
US6577989B2 US09/769,105 US76910501A US6577989B2 US 6577989 B2 US6577989 B2 US 6577989B2 US 76910501 A US76910501 A US 76910501A US 6577989 B2 US6577989 B2 US 6577989B2
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measured value
measuring transformer
transformer circuit
current
voltage
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US20010016802A1 (en
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Wilhelm Florin
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MESSTECHNIK & Co KG GmbH
Krohne Messtechnik GmbH and Co KG
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Krohne Messtechnik GmbH and Co KG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

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  • the invention relates to a circuit arrangement for measured value detection, transfer and analysis, with a measured value detection section, a measured value analyzing section and a connection consisting only of a outgoing conductor and a return conductor between the measured value detection section and the measured value analyzing section, in connection with which the measured value detection section has a measured value recorder, a measuring transformer circuit, a switch controller connected upstream from the measuring transformer circuit and a current regulator connected upstream from the switch controller, in connection with which the measured value analyzing section has a voltage source and an analyzing circuit, and the switch controller delivers a constant operating voltage for the measuring transformer circuit, and the current regulator, controlled by the measuring transformer circuit, sets a measured value and power supply current flowing through the outgoing conductor and the return conductor and representing the measured value.
  • Circuit arrangements of the kind in question are often conceived and designed in such a way that the voltage source in the measured value analyzing section is a direct voltage source, so the measured value and power supply current is a direct current.
  • These circuit arrangements are also frequently conceived and designed in such a way that the measured value and power supply current represents the measured value between a lower limit value, namely 4 mA and an upper limit value, namely 20 mA; the lower limit value of 4 mA thus represents the smallest measured value and the upper limit value of 20 mA the greatest measured value (cf. German Patent 39 34 007, Page 2, Lines 19 through 24).
  • the circuit arrangement in question is of the kind in which the voltage source provided in the measured value analyzing section is a direct voltage source, and the measured value and power supply current is thus a direct current. That is also why the connection between the measured value detection section and the measured value analyzing section was already described as consisting of an outgoing conductor and a return conductor.
  • the technical current direction will be taken as a basis throughout the following; in an electric circuit connected to a direct voltage source, the direct current thus flows from the plus pole of the direct voltage source via the electric circuit to the minus pole of the direct voltage source.
  • the section of the circuit arrangement in question that is designated above and in the following as the measured value and power supply current is also referred to as the transmitter station (cf. German Patent 39 34 007) or as sending point (cf. European Patent Disclosure 0,744,724 and German Patent Disclosure 197 23 645), while the section of the circuit arrangement in question that is designated here as the measured value analyzing section is also referred to as the receiving station (cf. German Patent 39 34 007) or as receiving point (cf. European Patent Disclosure 0,744,724 and German Patent Disclosure 197 23 645).
  • the connection, consisting of an outgoing conductor and a return conductor according to the terminology used here, between the measured value detection section and the measured value analyzing section is also referred to as a two-wire circuit station (cf. German Patent 39 34 007, European Patent Disclosure 0,744,724 and German Patent Disclosure 197 23 645).
  • the measured value current (representing the measured value—in the circuit arrangements concerned in this instance—as a rule, ranging from 4 mA to 20 mA as illustrated—is also the supply current for the measured value detection section
  • the electric power available for the measured value detection section is limited by the lower limit value of the measured value and power supply current, i.e., by 4 mA as a rule—which is often problematic (cf. German Patent 39 34 007, Page 2, lines 25 through 42).
  • the measuring transformer circuit (with the related measured value recorder—is actually the most important part in terms of function. Since the signal-to-noise ratio and the dynamic characteristics of the measuring transformer circuit depend on the power available for the measuring transformer circuit, the technical problem on which the invention is based is to optimize the power available for the measuring transformer circuit.
  • the aforementioned technical problem is solved for a circuit arrangement of the kind mentioned in the beginning first of all and essentially in that the current consumption of the measuring transformer circuit is controllable and is controlled in such a way that the voltage drop via the current regulator is as small as possible.
  • the fact that the technical problem on which the invention is based is solved with this measure and why this is so are explained in detail below with the help of drawings.
  • FIG. 1 illustrates a first embodiment of a circuit arrangement according to the invention
  • FIG. 2 shows a second embodiment of a circuit arrangement according to the invention
  • FIGS. 3 through 6 are graphical illustrations to further explain the invention.
  • FIGS. 1 and 2 are intended and suitable for measured value detection, transfer and analysis and consist in their basic design of a measured value detection section 1 , a measured value analyzing section 2 and a connection 5 consisting only of an outgoing conductor 3 and a return conductor 4 between the measured value detection section 1 and the measured value analyzing section 2 .
  • the measured value detection section 1 includes a measured value recorder 6 , only suggested, a measuring transformer circuit 7 , a switch controller 8 connected upstream from the measuring transformer circuit 7 and a current regulator 9 connected upstream from the switch controller.
  • the measured value analyzing section 2 includes a voltage source 10 and an analyzing circuit 11 . In the illustrated embodiment, two resistances 12 , 13 are also provided.
  • the analyzing circuit 11 is parallel to the resistance 13 ; the voltage drop originating at the resistance 13 and proportional to the measured value and power supply current is thus fed to analyzing circuit 11 .
  • the switch controller 8 supplies a (at least essentially) constant operating voltage for the measuring transformer circuit 7 .
  • German Patent 39 34 007, page 3, line 64, to page 4, line 45 as well as the following passages in relevant literature: Tietze.Schenk “Halbleiter-Scibilstechnik”, 10 th ed., Springer-Verlag, sections 18.5 “Schaltnetzella”, 18.6 “Sekundär getaktete Wegregler” and 18.7 “Primär getaktete Wegregler”, pages 565 through 586, and “Lexikon Elektronik und Mikroelektronik”, VDI-Verlag, page 733).
  • An ideal switch controller will be taken as a basis throughout the following, i.e., a zero-loss switch controller with constant output voltage.
  • the current regulator 9 is controlled by the measuring transformer circuit 7 .
  • the current regulator 9 sets a measured value and power supply current representing the measured value and flowing via the outgoing conductor 3 and the return conductor 4 .
  • the circuit section referred to here as the current regulator is also referred to as a controllable voltage source, at any rate in European Patent Disclosure 0 744 724 and in German Patent Disclosure 127 23 645.
  • the expression current controller is also used in place of the expression current regulator).
  • the voltage source 10 , the resistance 12 , the outgoing conductor 3 , the current regulator 9 , the primary side of the switch controller 8 , the return conductor 4 and the resistance 13 are series connected; they form a first electric circuit.
  • the secondary side of the switch controller 8 and the measuring transformer circuit 7 form a second electric circuit.
  • FIGS. 1 and 2 show another resistance 14 representing the resistance of the outgoing conductor 3 and a resistance 15 representing the resistance of the return conductor 3 .
  • U 2 the voltage at the “input” of the connection 5 , consisting of the outgoing conductor 3 and the return conductor 4 , between the measured value analyzing section 2 and the measured value detection section 1 ,
  • I 1 the current flowing through the measured value analyzing section 2 ,
  • I 2 the current flowing via the outgoing conductor 3 and the return conductor 4 ,
  • I 4 the current flowing on the primary side through the switch controller 8
  • I 5 the current flowing on the secondary side through the switch controller 8 and through the measuring transformer circuit 7 .
  • the power P 1 that the voltage source 10 makes available in the measured value analyzing section 2 is shown by the following equation:
  • R 12 is the value of the resistance 12 and R 13 the value of the resistance 13 , then the following is valid for the power loss P V,1 within the measured value analyzing section 2 :
  • R 14 is the value of the resistance 14 of the outgoing conductor 3 and R 15 is the value of the resistance 15 of the return conductor 4 , then the following is valid for the power loss P V,2 on the connection 5 between the measured value analyzing section 2 and the measured value detection section 1 :
  • the power P 3 that is available for the measured value detection section 1 is predetermined by the voltage U 1 of the voltage source 10 , the resistances R 12 , R 13 , R 14 and R 15 as well as by the current measured value and power supply current; the following is valid for the power P 3 :
  • FIGS. 1 and 2 show, the following furthermore applies to the currents I 3 , I 2 and I 1 :
  • the power P 3 available for the measured value detection section 1 is thus dependent on the measured value, namely the measured value and power supply current I 3 .
  • the measured value and power supply current I 3 is 4 mA for example, there is consequently less power available than with a large measured value, if the measured value and power supply current I 3 is 20 mA, for example.
  • the invention it is now ensured that of the power P 3 available for the measured value detection section 1 , the greatest possible portion is available for the measuring transformer circuit 7 , as shown by the following:
  • Equation 13 shows that the power P 5 that is available for the measuring transformer circuit 7 can be optimized by the greatest possible voltage U 4 . Since the voltage U 4 cannot become greater than the voltage U 3 , the difference between the voltage U 3 and the voltage U 4 must be as small as possible. “As small as possible”—instead of “zero”—takes into consideration that the current regulator 9 critically requires a minimal difference between the voltage U 3 and the voltage U 4 in order—controlled by the measuring transformer circuit 7 —to be able to set a measured value and power supply current I 3 representing the measured value.
  • the switch controller 8 Since it is a prerequisite that the switch controller 8 be zero-loss, i.e., that the primary-side power P 4 is identical to the secondary-side power P 5 because the primary-side current I 4 of the switch controller 8 is predetermined in the stationary condition, namely identical to the measured value and power supply current I 3 predetermined by the measuring transformer circuit 7 , and since the secondary-side voltage U 5 of the switch controller 8 is constant, a short-term reduction of the current consumption of the measuring transformer circuit 7 , i.e., a short-term reduction of the current I 5 flowing through the measuring transformer circuit 7 and on the secondary-side through the switch controller 8 , leads to an increase of the voltage U 4 on the primary side of the switch controller 8 , because the current I 3 , now greater than the current I 4 , can no longer by accepted by the switch controller 8 .
  • the switch controller 8 has a capacitor 16 on the input side.
  • An example of such a switch controller 8 is the switch controller LT 1176-5 of the Linea Technology company.
  • the capacitor 16 simplifies the control of the voltage U 4 , because in this way, the change rate of change of the voltage U 4 when I 3 is not set identically to I 4 can be reduced considerably.
  • the switch controller 8 is provided on the input side with a capacitor 16 , an operating status may develop in which the measured value and power supply current I 3 cannot be set proportionally to the measured value.
  • a second current regulator 17 controlled by the measuring transformer circuit 7 and only activated in case of need is provided that is connected with its input with the input of the first current regulator 9 and with its output with the return conductor 4 .
  • the measured value and power supply current I 3 that should be proportional to the measured value is composed of the current I 4 via the first current regulator 9 and the current I 6 via the second current regulator 17 .
  • the required measured value and power supply current I 3 can be set even in the operating status described above.
  • the current I 6 does not contribute via the second current regulator 17 to the power P 5 for the measuring transformer circuit 7 ; that is, the current I 6 via the second current regulator 17 is undesirable, in principle. Consequently, in the embodiment according to FIG. 2, the second current regulator 17 provided additionally in this instance is only activated “in case of need”, namely only when and as long as the problem described above still exists.
  • the measuring transformer circuit 7 can be programmable, e.g. via the voltage U 1 of the voltage source 10 and/or via the resistances 12 and 13 in the measured value analyzing section 2 and/or via the resistances 14 , 15 of the outgoing conductor 3 and/or of the return conductor 4 and/or via the capacitance of the capacitor 16 connected parallel to the input of the switch controller 8 .
  • the first current regulator 9 e.g. via an A-D converter, not illustrated, to control the current consumption of the measuring transformer circuit 7 and/or to control the second current regulator 17 .
  • the voltage U 3 at the input of the measured value detection section 1 should be considered first. It depends on the voltage U 1 of the voltage source 10 , the total of the resistances 12 , 13 , 14 and 15 as well as the current I 3 flowing through the measured value detection section 1 . In practical experience, very different characteristics may result in this case due to different measured value analyzing sections 2 and different connections 5 between measured value detection section 1 and the measured value analyzing section 2 . These are not known when the measured value detection section 1 is delivered; the measured value detection section 1 must therefore adapt automatically to the conditions encountered.
  • characteristic curves are illustrated that show the voltage U 3 at the input of the current regulator 9 depending on the current I 3 flowing through the measured value detection section 1 .
  • the following are based on
  • the characteristic curve a a voltage U 1 of 24V and a 300 ⁇ resistance of the connection 5
  • the characteristic curve b a voltage U 1 of 24 V and a 50 ⁇ resistance of the connection 5 , and
  • the characteristic curve c a voltage U 1 of 17 V and a 50 ⁇ resistance of the connection 5 .
  • the characteristic curve a for a voltage U 1 of 24 V and a 300 ⁇ resistance of the connection—is particularly widely used since this characteristic curve meets the requirements of intrinsic safety in the case of explosion protection.
  • the voltage U 4 at the output of the current regulator 9 is one volt below the voltage U 3 at the input of the current regulator 9 .
  • the corresponding characteristic curve d is shown in FIG. 4 together with the characteristic curve a from FIG. 3 .
  • the current regulator 9 is also necessary because the current I 5 flowing through the measuring transformer circuit 7 cannot be controlled as precisely as is required for the current U 3 representing the measured value.
  • the current regulator 9 is controlled by the measuring transformer circuit 7 in such a way that it sets a measured value and power supply current, the current I 3 , representing the measured value and flowing via the connection 5 .
  • the measuring transformer circuit 7 has a micro-controller 18 not shown in detail, that is also supplied by the current I 3 flowing through the measured value detection section 1 .
  • the circuit arrangement according to the invention can be used for a number of quite different measured value recorders 6 .
  • the measured value recorder 6 can be designed for detecting temperature, pressure, humidity, fill level or throughput, for example.
  • the measured value recorder 6 can be operated in clocked manner, whereby the current consumption of the measuring transformer circuit 7 can be influenced altogether.
  • Such a clocked operation is known in the case of a magnetic-inductive flowmeter, for example (cf. U.S. Pat. No. 4,766,770); a microwave radar can also be operated in clocked manner as a measured value recorder 6 .
  • the current regulator 9 must ensure a smoothing; a pulsating characteristic of the current I 3 , that is, of the measured value and power supply current representing the measured value, is namely not desired.
  • the extent of the necessary smoothing also determines the operation's required voltage drop via the current regulator 9 , that is, the voltage difference between the voltage U 3 and the voltage U 4 .
  • the graph in FIG. 5 is referred to, which first shows the characteristic curves a and d in which working points 1 , 2 and 3 are also drawn.
  • Working point 3 is now attained from working point 2 , but not by increasing the current I 5 .
  • the current I 4 would immediately become greater than the current I 3 , and charge would be taken from the capacitor 16 . This would in turn lead to a reduction of the voltage U 4 and thus to a shift of the working point 2 in the undesirable direction, namely to a smaller voltage U 4 .
  • the desired working point 3 is achieved when the current I 5 is reduced.
  • the current I 4 immediately becomes smaller than the current I 3 .
  • the capacitor 16 at the input of the switch controller 8 is charged and the voltage U 4 increases.
  • the graph in FIG. 6 is referred to, which, like FIG. 5, shows the characteristic curves a and d in which working points 1 , 2 and 3 are also drawn.
  • a sudden change of the voltage U 4 that is, a sudden change of the voltage at the input of the switch controller 8
  • the current regulator 9 is then not able to set the current I 3 attributable 100% to the measured value because even if the voltage U 4 were identical to the voltage U 3 , that is, if there were no voltage drop at the current regulator 9 , the measured value analyzing section 2 cannot deliver the corresponding current via the connection 5 ; the working point 2 is thus not a possible working point.
  • the second current regulator 17 shown in FIG. 2 which can set the corresponding current I 3 , that is, 20 mA in the present case.
  • the working point 3 is thus possible with the additional current regulator 17 .
  • the second current regulator 17 is thus not absolutely necessary but rather only when the voltage U 4 cannot be reduced at the same rate of change as the measured value can change.
  • I 3 4 mA+M, 16 mA
  • the setting automatically changes from the current regulator 9 to the second current regulator 17 . This can take place via the micro-controller 18 or by means of corresponding hardware.
  • circuit arrangement according to the invention has been described in connection with a voltage source 10 —designed as a direct voltage source—in the measured value analyzing section 2 , so the measured value and power supply current I 3 is present as direct current.
  • the lesson of the invention can also be easily applied to forms of construction in which an alternating voltage source is used as voltage source and consequently the measured value and power supply current I 3 is present as an alternating current.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Control Of Electrical Variables (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Dc Digital Transmission (AREA)
  • Measurement Of Current Or Voltage (AREA)
US09/769,105 1999-06-08 2001-01-25 Circuit arrangement for measured value detection, transfer and analysis Expired - Lifetime US6577989B2 (en)

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DE19925943.7 1999-06-08
DE19925943A DE19925943A1 (de) 1999-06-08 1999-06-08 Schaltungsanordnung zur Meßwerterfassung, -übertragung und -auswertung

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EP (1) EP1103038B1 (pt)
JP (1) JP4541615B2 (pt)
CN (1) CN1171186C (pt)
BR (1) BR0006657A (pt)
CZ (1) CZ2001459A3 (pt)
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DE102007021099A1 (de) 2007-05-03 2008-11-13 Endress + Hauser (Deutschland) Ag + Co. Kg Verfahren zum Inbetriebnehmen und/oder Rekonfigurieren eines programmierbaren Feldmeßgeräts
DE102007058608A1 (de) 2007-12-04 2009-06-10 Endress + Hauser Flowtec Ag Elektrisches Gerät
DE102008022373A1 (de) 2008-05-06 2009-11-12 Endress + Hauser Flowtec Ag Meßgerät sowie Verfahren zum Überwachen eines Meßgeräts
DE202010006553U1 (de) 2010-05-06 2011-10-05 Endress + Hauser Flowtec Ag Elektronisches Meßgerät mit einem Optokoppler
WO2011131399A1 (de) 2010-04-19 2011-10-27 Endress+Hauser Flowtec Ag Treiberschaltung für einen messwandler sowie damit gebildetes messsystem
DE102010030924A1 (de) 2010-06-21 2011-12-22 Endress + Hauser Flowtec Ag Elektronik-Gehäuse für ein elektronisches Gerät bzw. damit gebildetes Gerät
DE102011076838A1 (de) 2011-05-31 2012-12-06 Endress + Hauser Flowtec Ag Meßgerät-Elektronik für ein Meßgerät-Gerät sowie damit gebildetes Meßgerät-Gerät
US9243932B2 (en) 2010-12-22 2016-01-26 Endress + Hauser Gmbh + Co. Kg Measuring device for measuring a precess variable in industrial measurements and control technology
WO2018028932A1 (de) 2016-08-10 2018-02-15 Endress+Hauser Flowtec Ag Treiberschaltung, damit gebildete umformerelektronik und damit gebildetes messsystem
US10234485B2 (en) 2013-05-22 2019-03-19 Krohne Messtechnik Gmbh Measuring arrangement
US11009533B2 (en) 2015-06-29 2021-05-18 Vitesco Techologies GmbH Method for determining deviations between actual measured current values and setpoint current values in a plurality of parallel-connected current-regulated circuit paths
WO2024022656A1 (de) 2022-07-29 2024-02-01 Endress+Hauser Flowtec Anschlussschaltung für ein feldgerät und feldgerät

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US20020149379A1 (en) 2000-01-12 2002-10-17 Winfried Rauer Electronic measuring device for detecting a process variable, in particular a radar or ultrasonic filling level measuring device, and a method for operating a measuring device of this type
DE10256623A1 (de) * 2002-12-03 2004-06-24 Krohne Meßtechnik GmbH & Co KG Elektrisches Gerät und Verfahren zum Betreiben eines elektrischen Geräts
DE102007035710A1 (de) * 2007-07-30 2009-02-05 Siemens Ag Messumformer und Stellungsregler zum Anschließen an eine Zweileiter-Stromschleife sowie deren Verwendung
DE102008043199A1 (de) 2008-10-27 2010-04-29 Endress + Hauser Process Solutions Ag Autarkes Feldgerät
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DE102013100799A1 (de) 2012-12-21 2014-06-26 Endress + Hauser Flowtec Ag Umformerschaltung mit einer Stromschnittstelle sowie Meßgerät mit einer solchen Umformerschaltung
DE102013109096A1 (de) 2013-08-22 2015-02-26 Endress + Hauser Flowtec Ag Gegen Manipulation geschütztes elektronisches Gerät
DE102014108107A1 (de) 2014-06-10 2015-12-17 Endress + Hauser Flowtec Ag Spulenanordnung sowie damit gebildeter elektromechanischer Schalter bzw. Meßumformer
DE102018122014A1 (de) 2018-09-10 2020-03-12 Endress + Hauser Flowtec Ag Meßgeräte-System sowie damit gebildete Meßanordnung
CN112462841A (zh) * 2020-10-29 2021-03-09 国网山东省电力公司东营市东营区供电公司 一种实时监控变压器自动调档装置

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Cited By (18)

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Publication number Priority date Publication date Assignee Title
WO2008135397A1 (de) 2007-05-03 2008-11-13 Endress+Hauser (Deutschland) Ag+Co. Kg Verfahren zum inbetriebnehmen und/oder rekonfigurieren eines programmierbaren feldmessgeräts
DE102007021099A1 (de) 2007-05-03 2008-11-13 Endress + Hauser (Deutschland) Ag + Co. Kg Verfahren zum Inbetriebnehmen und/oder Rekonfigurieren eines programmierbaren Feldmeßgeräts
DE102007058608A1 (de) 2007-12-04 2009-06-10 Endress + Hauser Flowtec Ag Elektrisches Gerät
DE102008022373A1 (de) 2008-05-06 2009-11-12 Endress + Hauser Flowtec Ag Meßgerät sowie Verfahren zum Überwachen eines Meßgeräts
WO2011131399A1 (de) 2010-04-19 2011-10-27 Endress+Hauser Flowtec Ag Treiberschaltung für einen messwandler sowie damit gebildetes messsystem
DE202010006553U1 (de) 2010-05-06 2011-10-05 Endress + Hauser Flowtec Ag Elektronisches Meßgerät mit einem Optokoppler
DE102010030924A1 (de) 2010-06-21 2011-12-22 Endress + Hauser Flowtec Ag Elektronik-Gehäuse für ein elektronisches Gerät bzw. damit gebildetes Gerät
WO2011160949A1 (de) 2010-06-21 2011-12-29 Endress+Hauser Flowtec Ag Elektronik-gehäuse für ein elektronisches gerät bzw. damit gebildetes gerät
US9243932B2 (en) 2010-12-22 2016-01-26 Endress + Hauser Gmbh + Co. Kg Measuring device for measuring a precess variable in industrial measurements and control technology
DE102011076838A1 (de) 2011-05-31 2012-12-06 Endress + Hauser Flowtec Ag Meßgerät-Elektronik für ein Meßgerät-Gerät sowie damit gebildetes Meßgerät-Gerät
US9109936B2 (en) 2011-05-31 2015-08-18 Endress + Hauser Flowtec Ag Measuring device electronics for a measuring device as well as measuring device formed therewith
WO2012163608A1 (de) 2011-05-31 2012-12-06 Endress+Hauser Flowtec Ag Messgerät-elektronik für ein messgerät-gerät und verfahren zum überprüfen des messgeräts
US10234485B2 (en) 2013-05-22 2019-03-19 Krohne Messtechnik Gmbh Measuring arrangement
US11009533B2 (en) 2015-06-29 2021-05-18 Vitesco Techologies GmbH Method for determining deviations between actual measured current values and setpoint current values in a plurality of parallel-connected current-regulated circuit paths
WO2018028932A1 (de) 2016-08-10 2018-02-15 Endress+Hauser Flowtec Ag Treiberschaltung, damit gebildete umformerelektronik und damit gebildetes messsystem
DE102016114860A1 (de) 2016-08-10 2018-02-15 Endress + Hauser Flowtec Ag Treiberschaltung sowie damit gebildete Umformer-Elektronik bzw. damit gebildetes Meßsystem
WO2024022656A1 (de) 2022-07-29 2024-02-01 Endress+Hauser Flowtec Anschlussschaltung für ein feldgerät und feldgerät
DE102022119145A1 (de) 2022-07-29 2024-02-01 Endress+Hauser Flowtec Ag Anschlussschaltung für ein Feldgerät und Feldgerät

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EP1103038A1 (de) 2001-05-30
US20010016802A1 (en) 2001-08-23
CN1313978A (zh) 2001-09-19
DK1103038T3 (da) 2012-11-05
WO2000075904A1 (de) 2000-12-14
JP4541615B2 (ja) 2010-09-08
EP1103038B1 (de) 2012-08-15
BR0006657A (pt) 2001-05-02
DE19925943A1 (de) 2000-12-21
JP2003501761A (ja) 2003-01-14
CZ2001459A3 (cs) 2001-08-15
CN1171186C (zh) 2004-10-13

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